Brake



sept. 1o, 192.9. w ANDRES 1,727,923

BRAKE Filed June 2o, 1927 INVENTOR WILLI/w J. ANDRES ATTORNEYv Patented Sept, l0, 1929.

UNITED STATES PATENT OFFICE.

WILLIAM J. ANDRES, 0l' SOUTH BEND, INDIANA, ASSIGNOB TO BENDIX BRAKE COM? PANY, Ol' CHICAGO, ILLINOIS, CORPORATION'OF ILLINOIS.

BRAKE.-

Application lied Jue 20, 1987. Serial lo. 199,870.

This invention relates to brakes and is illustrated as embodied in an internal expanding automobile brake. An object of the invention is to provide for inter-engagement of the shoes or other friction means of the brake, to prevent lateral movement thereof, with a pair of appl 'ng devices such as cams which are shifta ly mounted on an operating shaft so that they balance their pressures automatically between the two ends. In the arrangement shown in the brakes there are thrust rollers arranged on opposite sides of said ends in engagement w1th the cams. I prefer to 4ilatten a portion of the shaft and to .provide the cams. with slots embracing the flattened portion ofthe shaft, so that the cams may shift without interfering with their angular-movement when thel shaft is rotated.

The above and other objects andv features of the invention, includin various novel and desirable structural detai s, will be apparent from the following description of the illus-l trative embodiment shown 1n the accompanyingdrawing, in which:

igure 1 is a vertical section through the upper part of the brake, just inside the -head of the brake drum, showing the brake shoes in side elevation;

Figure 2 is a partial section `throu h the applying means on the line 2-2 of igure l; an

Figure 3 is a partial section on the line 3 3 of Figures 1 and 2, showing the brakeapplying means.

The rake selected for illustration includes a rotatable drum 10 rat the open side of which is a stationary support such as a backing late 12, and within which is arranged t e friction means of the brake, illustrated as including shoes 14 and 16, urged' away from-the drum toward idle p0- sition by means such as a return spr' 18.

At their adjacent ends, the shoes 14 and 16 or their equivalents are preferably rovided on op oslte sides with thrust ro lets 20, pivote on spindles 22, and engaged' by a pair of shiftable applying devices such as stamped cams 24 and 26 am to embrace the endl of the shoe. betwom them to prevent them from moving laterallyTThe cams 24 and 26 are provided with slots 28 to embrace a flattened portion of a cam shaft 30, so that the cams may balance themselves between the two shoes in ncase Vofmuneqnal wear.

In the arrangement illustrated, the cams 24 and 26, or e uivalent applying devices, are assembled on t e shaft 30`with suitable spacing washers 32 held by a resilient sna ring 34 in a groove in the end of the sha t. If desired, the snap Aringmay serve as a lock washer and in that case the groove is formed by threadin into the end of the shaft a cap screw 36. y tightening up on the cap screw 36 more/or less pressure may be applied through the lock washer 34 through the assembly of washers land cams so that the cams are frictionally held against shifting except when uneven wear of the brake shoes makes the shifting necessary.

While one illustrative embodiment has been described in detail, it is not my intention to limit the scope of the invention to that particular embodi'ment or otherwise than by the terms of the I claim:

1. A brake including 'friction means having adjacent separable ends provided with thrust members on `their opposite sides, in combination with a shaft between said ends and'a pair of applying devidas individually shiftab y mounted directly on said shaft and embracing the ends of the friction means vto prevent lateral movement and operatively engaging the thrust members.

2. A brake including friction means having adjacent ends, in combination with a shaft having individually-shiftable apply'- iu devices directly mounted on the shaft an acting on said ends to apply the brake and also embracing said ends between them.

3. A brake including friction means having' adjacentv ends, in combination with a shaft having a flattened portion and a pair of appjlying devices slotted and individually shifta ly mounted on said attened portion of the shaft and acting on said ends to a ply the brake and also embracing said en s #een them.

appended claims.

4. A brake including friction means having adjacent ends, in combination with a shaft havingv a flattened portion and a pair of applying devices slotted and individually shiftably mounted on said flattened portion of the shaft and acting on said ends to apply the brake.

5. A brake including friction 'means hav ing adjacent ends provided with thrust rollers on their opposite sides, in combination with a shaft having a pair of individually mounted applying devicesshiftably mounted thereon and engaging said rollers and embracing said ends between them.

6. A brake-applying device including a shaft having a flattened portion', in combination with a pair of applying devices slotted to embrace said flattened portion of the shaft and spacing washers encircling the Shaft between the applying devices.

7. A brake-applying device including a shaft having a fiattened portion, in combination with a pair of applying devices slotted to embrace said attened portion of the shaft and means for yieldingly resisting shifting of said devices on the shaft, said means including a cap screw threaded into the end of the shaftl and aspring compressed by the cap screw.

8. A brake comprising friction means having adjacent separable ends, in combination with a shaft having individually shiftable applying devices mounted directly thereupon between the separable ends of said friction means to rotate with the shaft to actuate .said ends but automatically slidably shiftable over the shaft.

9. A brake comprising friction means havi ing adjacent separable ends in combination with a shaft havin'g a non-circular portion and two separate and distinct cam members mounted upon said non-circular portion of the shaft to rotate therewith to actuate said friction means vbut automaticall shftable over said non-circular portion o the shaft. In testimony whereof, I have hereunto signed my name.

WILLIAM J. ANDRES. 

